Oh man I’ve spent so long not being able to watch Youtube videos, well they play but with no sound, bloody frustrating. Tried many lines of attack through Google and only just managed to crack it. The problem is widely reported but most of the suggested fixes don’t work.

voodoo fix #1: the most widely “documented” fix is to launch /Applications/Utilities/Audio MIDI Setup.app and change the properties for built-in output from the default 44khz, to 96khz, then back to 44 – doesn’t work

voodoo fix #2: this one I like, launch Garage Band and the audio prob will be fixed, nada